A friend of mine is offering me his gtx 660Ti for a decent price. I already have one of these so was thinking of running SLI. My rig is managing with 6 boxing but I see fps drop to 5 and below if I mass pull trash. Would running a second gfx card help? When I trash pull my cpu goes from 70‰ to 95%+ so I am *guessing* this is the issue and don't want to buy the card if I won't see an improvement Any advice gratefully received!